Partial product machine



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May 26, 1953 D. H. REEVES 2,639,860

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May 26, 1953 D. H. REEVES PARTIAL PRODUCT MACHINE 19 Sheets-Sheet 18Filed Oct. 25, 1947 May 26, 1953 D. H. REEVES PARTIAL PRODUCT MACHINE.

19 Sheets-Sheet 19 Filed om, '25, 1947 \rnumrf E N om //////7////v//////A Patented May 26, 1953 UNITED STATES PATENT' OFFICE 9 Claims.

This invention relates to a computing machine and more particularly to acomputing machine for the purpose of multiplying.

In the past, computing machines of the types in common use have been soconstructed that multiplication is accomplished by adding the amount tobe multiplied a number cf times, the number depending upon the value ofthe multiplier, thereby requiring several operations of the machine inorder to obtain one complete computation and averaging ve operations ofthe machine for each digit in the multiplier. Thus, a three digitmultiplier averages fifteen operations and may go as high astwenty-seven. While such machines have been developed to a point wherethe operations are quite rapid, yet multiplication by this method issomewhat slower than would be the case with a machine that is so made asto multiply any two given numbers in a single operation of the machine.

While numerous patents have been issued on machines that multiply bywhat is known as the partial product method, rather than by the repeatedaddition method, these machines have been extremely complicated andnecessarily of such size and weight as to greatly reduce theirpracticability, at the same time greatly increasing their cost. 'In thedesigns used for some of these machines, it Ais still necessary toperform several operations of the machine in order to complete onecomputation, although the number of operations is less than in the caseof repeated addition. These disadvantages have greatly limited thedesirability of these machines and, as a result, very few partialproduct machines are in actual use.

An object of this invention is to improve computing machines. Morespecically, an object of this invention is to provide a machine whichwill so operate as to require only one operation in order to completethe multiplication of any two given numbers and in which that singleoperation Will require an extremely short period of time.

Another object of this invention is to provide a computing machine ofthe type described which indicates the amount of the result of thecomputation at the end of its operation, but does not require a separateoperation of the machine or on the part of the operator in order toclear the machine of the previous computation, or, in other words, toreset the mechanism to zero, before a new computation can be made;instead, in my invention the mechanism is automatically cleared at thebeginning of each operation,

thereby further reducing the number of operations of the machine or ofthe operator that are required for a complete computation.

Another objectof this invention is to provide a computing machine of thetype described in which the amount keys that must be depressed by theoperator are not required to move any part o the computing mechanism,resulting in extremely easy and fast key operation.

Another object of this invention is to provide a computing machine ofthe type described which will be so light in weight and so small in sizeas to be easily moved from one place to another. The small size willalso make it practical to use this machine on a desk, in the same manneras portable adding and computing machines are now used.

Another object of this invention is to provide a computing machine ofthe type described that is so designed as to require less parts than isthe case in previous designs and which can be constructed at a lowercost.

Another object of this invention is to provide a machine of the typedescribed which is so designed that as many as possible of the necessarysteps which are required for the completion of the computation areperformed simultaneously in order to reduce the number of successiveoperations and consequently reduce the total time necessary for thecompletion of the computation.

Another object of this invention is to provide a computing machine ofthe type described which will have yextreme iiexibility of operation, sothat in case the same multiplicand or the same multiplier is to be usedin successive operations of the machine, the completion of eachoperation of the machine can be made to release the keys for either themultiplicand or the multiplier, as designed, While the keys for theother remain depressed. Likewise, if an error is made in depressing thekeys for either the multiplicand or the multiplier, the keys for eitherone can be released without releasing the keys for the other.

Another object of this invention is to provide a basic multiplyingmechanism which can be used in connection With adding and/or subtractingmechanism, printing mechanism, type- Writing mechanism, et cetera, forproducing more complete machines for various types of Work requiringsuch machines.

Other objects and advantages reside in the construction of parts, thecombination thereof and the mode of operation, as will become moreapparent from the following description.

